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Navegando por Assunto "Euforbiácea"

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    Essential oil composition of Croton palanostigma Klotzsch from north Brazil
    (2009) BRASIL, Davi do Socorro Barros; MÜLLER, Adolfo Henrique; GUILHON, Giselle Maria Skelding Pinheiro; ALVES, Claudio Nahum; ANDRADE, Eloisa Helena de Aguiar; SILVA, Joyce Kelly do Rosário da; MAIA, José Guilherme Soares
    The essential oils of leaves, twigs, branches, trunk bark and fruits of Croton palanostigma were analyzed by GC and GC-MS. The main compounds found in the oil of the leaves were linalool (25.4%), (E)-caryophyllene (21.0%), methyleugenol (17.2%) and β-elemene (6.0%); in the oil of the twigs were α-pinene (41.4%), limonene (29.0%), sabinene (11.5%) and β-pinene (5.7%); in the oil of the branches were methyleugenol (24.1%), (E)-methylisoeugenol (15.3%), α-pinene (11.2%) and (E)-caryophyllene (8.5%); in the oil of the trunk bark were a-pinene (31.6%), methyleugenol (25.6%) and (E)-methylisoeugenol (23.7%); and in the oil of the fruits were linalool (42.7%), methyleugenol (16.3%) and β-elemene (6.4%). Statistical analysis showed that the leaves and fruit, and the branches and trunk bark, have significant similarities between them. In addition, the trunk bark oil has high brine shrimp larvicidal activity (LC50, 3.71 ± 0.01 mg mL-1).
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    Isolamento e quantificação de flavonóides e abordagem das atividades antioxidante e antimicrobiana de Jatropha gossypiifolia L.
    (Universidade Federal do Pará, 2008-12-30) VEIGA, Andrex Augusto Silva da; BARBOSA, Wagner Luiz Ramos; http://lattes.cnpq.br/1372405563294070
    Jatropha gossypiifolia L (Euphobeaceae), known in Pará as “Pião roxo” is used for treatment of hemorroids, burns, stomach pains among other diseases, the importance of this plant to this region has led to its research in order to improve its phytotherapeutic development. During the analysis, the chromatographic profiles of its Crude Ethanolic Extract (CEE)was determined using Thin Layer chromatography (TLC) and High Performance Liquid Chromatography (HPLC) methods. The total and isolated flavonoids quantities were determined. Antimicrobial activity essays of the crude ethanolic extract were also conducted and the fractions obtained (hexanic, chloroform, ethyl acetate and residual fractions). The antioxidant activities of the extract and the fractions were also characterized. The plant materials were collected from EMBRAPA medicinal plants garden in the east Amazon and then extracted through percolation to obtain crude ethanolic extract. The dry extract was obtained using low pressure rotative evaporator followed by liquid-liquid partition with hexane, chloroform and ethyl acetate successively. The fractions obtained were also concentrated at low pressure, The ethyl acetate fractions were re-fractioned, giving rise to acetone fraction (ActF-II), a new ethyl acetate (AF-II), methanolic fraction (MF-II) and a solid residue (SR-II). ActF-II was submitted to liquid chromatography at average pressure, resulting in sub-fractions like Fr ActS-II and Fr ActS3-II called Jg1 and Jg2, respectively. Chemical prospection of the Extract and the metabolite fractions were conducted in triplicates, leading to the observation of the presence of the following polyphenols: Catechines, Tannins and flavonoids. The analysis by thin Layer Chromatography (TLC) was conducted using eluent of ethyl acetate/formic acid/glacial acetic acid/water at (100:11:11:26) on a normal phase silica gel, showing the retention factors in the following zones:0.65, 0.72, and 0.77 in reaction to Fecl3 solution . The HPLC chromatogram of ethanolic crude extract presented three significant peaks with average values of RT: 13.2 min, 15.02 min, and 16.00 min whose spectra are characteristics of flavonoids. On calculating the flavonoid quantity using the average absorbance reading (A=0.874), 2.02% flavonoid was found. The concentrations for each isolated substances was 340ug for Jg1 and 406 ug for Jg2 per milliliter of extract solution. Regarding the biological activity tested AF-1 and Fr-1 inhibited growths of S. aureus and C.albicans and also manifested a great antioxidant potential. These results provide adequate polyphenol parameters for quality control serving as chemical markers and their possible quantities.
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